A cement head for cementing a well

Abstract

The application relates to the technical field of oil exploitation related equipment, and discloses a cement head for well cementing, which comprises a cement head body, a head cap and a rubber plug, a blocking pin assembly is installed on the cement head body, and a driver is installed on the blocking pin assembly; the blocking pin assembly comprises: a mounting box which is fixedly installed on the outer wall of the cement head body. The cement head for well cementing is provided with a position control pull block and a synchronous auxiliary push block, the two are reversely linked through transmission gears, when the pull handle is pulled, the position control pull block drives the blocking pin body to slide into a blocking pin placing groove, the synchronous auxiliary push block is synchronously caused to exit a supporting position, the blocking pin body can be autonomously rotated to release the limitation on the rubber plug; when reset, the synchronous auxiliary push block is reversely moved under the driving of the transmission gear, the blocking pin body is pushed back to the original position by an auxiliary wheel and support is provided; the design does not need the traditional multi-rotation thread connection, the blocking pin state switching operation is simplified, and the requirement of quick response in well cementing operation is met.

Description

Technical Field

[0001] This invention relates to the technical field of equipment related to oil extraction, specifically a cementing head. Background Technology

[0002] In cementing operations in oil and gas drilling projects, the cement head is the core equipment connecting the cement pump and the casing, and its performance is directly related to the safety and efficiency of cement slurry injection. As a key component for controlling the downward movement of the rubber plug, the stop pin needs to reliably limit and quickly release the rubber plug to meet the needs of high-intensity and high-efficiency cementing construction. Especially in deep well and complex well operations, the ease of operation of the stop pin has a significant impact on the construction progress.

[0003] Existing cementing heads used in oil extraction mainly consist of a body, a sealing cap, a rubber plug, a retaining pin, a slurry inlet, and a rubber plug position indicator. The retaining pin is a laterally movable structure, located on the side wall of the body and abutting against the lower end of the rubber plug to limit its downward movement. The slurry inlet is located between the rubber plug and the sealing cap. The rubber plug position indicator provides feedback on the rubber plug position through the contact between the pin and the rubber plug. The retaining pin is threaded to the body and moves laterally by rotation, thereby limiting and releasing the rubber plug. It is an important component for controlling the rubber plug's stroke during cementing operations. For example, Chinese Patent Publication No. CN118309389B describes a cementing head for oil extraction, comprising a body with a sealing cap at the upper end and a rubber stopper inside. The body has a slurry inlet and a stop pin on its side wall. The stop pin abuts against the lower end of the rubber stopper. The slurry inlet is located between the rubber stopper and the sealing cap. A rubber stopper position indicator is connected to the lower end face of the sealing cap. The rubber stopper position indicator includes a push pin and a syringe sleeved outside the push pin. The upper end of the syringe is connected to the sealing cap. Both ends of the push pin extend out of the sealing cap and the syringe, with the lower end abutting against the rubber stopper. A stepped portion is provided on the outer side of the push pin. A stop portion is provided at the lower end of the syringe's inner hole. The stepped portion is located above the stop portion and a spring is provided between it and the lower end face of the sealing cap. A channel is provided on the side wall of the syringe, communicating with the inner hole of the syringe. This cementing head, by providing a channel on the side wall of the syringe, allows solid material that has seeped into the syringe to be squeezed and temporarily stored in the channel, delaying the time the push pin is trapped and increasing the single-use time of the rubber stopper position indicator.

[0004] However, the existing threaded connection structure of the stop pin in cementing heads has obvious drawbacks in actual operation. When releasing the rubber plug, the stop pin needs to be rotated 10-30 times to exit the limited position. The operation is cumbersome and time-consuming. In time-sensitive scenarios such as emergency cementing, it is easy to delay the release of the rubber plug and reduce construction efficiency. At the same time, frequent multi-turn rotation will aggravate thread wear, and the long-distance and multiple sliding of the stop pin will cause wear at the contact point with the rubber plug, affecting the service life and reliability of the stop pin. It is difficult to meet the requirements of fast and stable cementing operations. Therefore, it is urgent to improve the existing cementing head. Summary of the Invention

[0005] The purpose of this invention is to provide a cementing head to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a cementing head, comprising a cementing head body, a head cap and a rubber plug, wherein a stop pin assembly is mounted on the cementing head body, and a driver is mounted on the stop pin assembly; The stop pin assembly includes: The mounting box is fixedly installed on the outer wall of the cement head body, and a control pull block is slidably installed inside the mounting box. A stop pin body located inside the cement head body is rotatably installed at the end of the control pull block. The control groove is provided on both the mounting box and the side wall of the cement head body and corresponds to the control pull block and the stop pin body. The inner wall of the cement head body is provided with a stop pin placement groove that communicates with the control groove. The synchronous auxiliary push block is slidably installed in the mounting box to push the stop pin body to reset. The mounting box is equipped with a transmission mechanism corresponding to the synchronous auxiliary push block to ensure that the control pull block drives the synchronous auxiliary push block to slide in the opposite direction when it slides. When the stop pin body is in contact with the control groove, the outer end supports the rubber plug, and the auxiliary push block is located below the stop pin body.

[0007] Preferably, the stop pin assembly further includes: The shrinkage groove is located inside the mounting box and is used to install the synchronous auxiliary push block. The top of the outer end of the synchronous auxiliary push block is rotatably mounted with an auxiliary wheel that is in contact with the bottom surface of the stop pin body. The receiving groove, which is located on the inner wall of the cement head body and communicates with the shrinkage groove, is used to receive the end of the synchronous auxiliary push block and the auxiliary wheel.

[0008] By adopting the above technical solution, the synchronous auxiliary push block supports the stop pin body through the auxiliary wheel, and the shrinkage groove and the storage groove store the end of the synchronous auxiliary push block, reducing sliding friction, ensuring smooth rotation and reset of the stop pin body, and avoiding jamming.

[0009] Preferably, the distance by which the stop pin body slides out of the control groove is the same as the distance by which the synchronous auxiliary push block slides into the storage groove, and when the stop pin body is located in the stop pin placement groove, the outer wall is in contact with the outer end face of the synchronous auxiliary push block.

[0010] By adopting the above technical solution, the sliding distance of the stop pin body is the same as the sliding distance of the synchronous auxiliary push block, and the state switching of the two is synchronized. When the stop pin body enters the groove, it fits with the synchronous auxiliary push block, thereby improving the structural fit accuracy.

[0011] Preferably, the transmission mechanism includes: The transmission gear is rotatably mounted inside the mounting box, and the transmission gear is located between the control pull block and the synchronous auxiliary push block; The transmission tooth groove is formed on the bottom surface of the control block and meshes with the transmission gear. The force-bearing tooth groove is located on the top surface of the synchronous auxiliary push block and meshes with the transmission gear.

[0012] By adopting the above technical solution, the transmission gear connects the control block and the synchronous auxiliary push block, ensuring precise tooth meshing transmission, avoiding power loss, and ensuring coordinated reverse movements of the stop pin body and the synchronous auxiliary push block, thereby enhancing the reliability of the mechanism.

[0013] Preferably, the driver includes: The drive gear is rotatably mounted inside the mounting box and is not above the control pull block, and the top of the control pull block has a drive tooth groove corresponding to the drive gear. The drive shaft is rotatably mounted in the mounting box and fixedly connected to the drive gear. A transmission frame is mounted on the outer end of the drive shaft, and a handle is mounted on the outer wall of the transmission frame. The positioning rod is rotatably mounted on the outer wall of the transmission frame near the mounting box.

[0014] By adopting the above technical solution, the drive gear is linked with the handle, and the drive shaft drives the control block. The positioning rod helps to fix the position, which can be operated without tools, reducing the difficulty of manual operation.

[0015] Preferably, when the inner end face of the control block is in contact with the inner end face of the control groove, the outer end of the synchronous auxiliary push block is located below the stop pin body, and when the inner end face of the synchronous auxiliary push block is in contact with the inner end face of the shrinkage groove, the stop pin body is located in the stop pin placement groove.

[0016] By adopting the above technical solution, when the control pull block and the synchronous auxiliary push block are respectively attached to the corresponding groove, the stop pin body is precisely in the supported or unlocked state, and the double limit avoids loosening, ensuring reliable positioning of the rubber plug.

[0017] Preferably, a locking device corresponding to the positioning rod is installed on the outer wall of the cement head body to restrict the position of the positioning rod. When the stop pin body is in the state of supporting the rubber plug, the locking device will lock the positioning rod to ensure the fixation of the position of the stop pin body.

[0018] By adopting the above technical solution, the locking device locks the positioning rod, ensuring that the stop pin body does not loosen when supporting the rubber plug, avoiding accidental release of the stop pin body, and improving the safety of cementing operations.

[0019] Preferably, the locking device includes: The first housing and the second housing are both installed on the outer wall of the cement head body and are not above the stop pin assembly. Locking blocks that cover the positioning rod are slidably installed inside the first housing and the second housing. Top shell plate, which is installed on top of the first and second shells; A spring is installed inside the first housing and the second housing, with one end of the spring in contact with the top housing plate and the other end in contact with the locking block; The handle is fixedly installed on the outer wall of the locking block, and the outer walls of the first and second housings are both provided with movable grooves corresponding to the handle.

[0020] By adopting the above technical solution, the locking block automatically engages with the positioning rod under the action of the spring, and the handle can be quickly unlocked.

[0021] Preferably, both the first housing and the second housing are connected to the cement head body by bolts, and the outer walls of the first housing and the second housing are in contact with each other; The top shell plate has multiple sets of through holes, and the top shell plate is connected to the first shell and the second shell by multiple sets of bolts to fix the connection between the first shell and the second shell; The first housing has a positioning block installed on its bottom outer wall, and the second housing has a positioning slot that mates with the positioning block on its bottom outer wall.

[0022] By adopting the above technical solution, the first shell and the second shell are connected by positioning blocks, the top shell plate is detachable, and individual damaged parts can be replaced independently, reducing maintenance complexity and cost.

[0023] Preferably, the bottom cross-section of the locking block is inverted L-shaped, and the outer wall of the bottom of the locking block is in contact with the outer wall of the positioning rod, and the outer corner of the bottom of the locking block is designed with an angle.

[0024] By adopting the above technical solution, the beveled edges and corners facilitate operation, balancing safety and convenience. The bottom of the locking block fits into the positioning rod, ensuring the stability of the stop pin support and preventing accidental unlocking caused by external force.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This cementing head features a control pull block and a synchronous auxiliary push block. Because the stop pin assembly includes both control pull blocks and synchronous auxiliary push blocks, and these two are linked in opposite directions via transmission gears, when the handle is pulled, the control pull block causes the stop pin body to slide into the stop pin placement groove, simultaneously causing the synchronous auxiliary push block to exit the support position. The stop pin body can then rotate independently to release the restriction on the rubber plug. During reset, the synchronous auxiliary push block moves in the opposite direction under the drive of the transmission gears, pushing the stop pin body back to its original position and providing support via the auxiliary wheel. This design eliminates the need for multiple rotations in traditional threaded connections, simplifying the stop pin state switching operation and meeting the rapid response requirements in cementing operations. 2. This cementing head ensures synchronized operation by setting the distance of the stop pin body sliding out of the control slot to be the same as the distance of the synchronous auxiliary push block sliding into the receiving slot. At the same time, the stop pin placement slot and the control slot are in contact with the stop pin body to limit its sliding trajectory and prevent deviation. When the stop pin body supports the rubber plug, the synchronous auxiliary push block is located below it, and the auxiliary wheel is in contact with the bottom surface of the stop pin body to provide additional support. The meshing transmission of the transmission gear and the tooth groove ensures that the power transmission is not loose, so that the support state of the stop pin on the rubber plug is stable and avoids the cementing operation from being affected by shaking. 3. The cement head has a positioning rod in its driver, and the locking block of the locking device can automatically engage the positioning rod under the action of a spring. When the stop pin body supports the rubber plug, the inverted L-shaped structure at the bottom of the locking block fits against the positioning rod to prevent it from rotating accidentally and causing the stop pin to loosen. When the lock is released, pulling the handle will cause the locking block to compress the spring and disengage from the positioning rod. The operation is convenient and the locking is reliable, avoiding safety hazards caused by the accidental release of the stop pin. 4. In this cementing head, the mounting box and control pull block of the stop pin assembly are assembled independently, and the transmission gear and tooth groove can be replaced individually after wear. The first and second housings of the locking device are connected to the slot through the positioning plug, and the top shell plate is removable. The replacement of vulnerable parts such as springs and locking blocks does not require the whole body to be replaced. This design reduces the disassembly and assembly steps and maintenance costs during maintenance, reduces the overall downtime caused by component damage, and meets the needs of high-frequency use in industrial scenarios. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural diagram of the entire invention; Figure 2 This is a three-dimensional structural diagram of the present invention after partial cross-section; Figure 3 In this invention Figure 2 A schematic diagram of the planar structure in the desired state; Figure 4 This is a schematic diagram of the planar structure of the pin assembly after a side section in this invention; Figure 5 For the present invention Figure 4 A magnified 3D structural diagram of point A in the middle; Figure 6 For the present invention Figure 4 A magnified 3D structural diagram of point B in the middle; Figure 7 This is a three-dimensional structural diagram of the disassembled stop pin assembly, driver, and locking device components of the present invention. Figure 8 This is a three-dimensional structural diagram of the stop pin assembly, driver and locking device components of the present invention from another perspective after disassembly; Figure 9 This is a three-dimensional structural diagram of the stop pin assembly and the cement head body after the limitations on the stop pin body have been removed in this invention. Figure 10 In this invention Figure 9 A schematic diagram of the planar structure in the specified state.

[0027] In the picture: 1. Cement head body; 2. Headgear; 3. Quick-connect coupling; 4. Connection end; 5. Rubber stopper; 6. Stop pin assembly; 60. Mounting box; 61. Control pull block; 610. Control slot; 62. Stop pin body; 620. Stop pin placement slot; 63. Drive gear groove; 64. Synchronous auxiliary push block; 640. Retraction groove; 641. Auxiliary wheel; 642. Storage groove; 65. Transmission gear; 66. Transmission gear groove; 67. Force-bearing gear groove; 7. Driver; 70. Drive gear; 71. Drive shaft; 72. Transmission frame; 73. Handle; 74. Positioning rod; 8. Locking device; 80. First housing; 801. Second housing; 81. Top housing plate; 82. Locking block; 83. Spring; 84. Handle; 85. Movable groove; 86. Positioning block; 87. Positioning slot. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Please see Figures 1 to 10 The present invention provides a technical solution: a cementing head, comprising a cementing head body 1, a head cap 2, a quick-connect connector 3, a connecting end 4, and a rubber plug 5; Among them, a stop pin assembly 6 is installed on the cement head body 1, and a driver 7 is installed on the stop pin assembly 6. Through the linkage of various mechanisms, the rubber stop 5 is quickly limited and released, solving the problem of cumbersome and time-consuming operation of traditional stop pins.

[0030] The stop pin assembly 6 in this embodiment mainly consists of a mounting box 60, a control pull block 61, a control groove 610, a stop pin body 62, a stop pin placement groove 620, a drive tooth groove 63, a synchronous auxiliary push block 64, a shrink groove 640, an auxiliary wheel 641, a storage groove 642, and a transmission mechanism. An installation box 60 is fixedly installed on the outer wall of the cement head body 1, and a control block 61 is slidably installed inside the installation box 60. At the same time, a stop pin body 62 is rotatably installed at the end of the control block 61. The control block 61 is used to drive the stop pin body 62 to slide and subsequently limit the position of the stop pin body 62. Meanwhile, the stop pin body 62 is located inside the cement head body 1 and is used to support the rubber plug 5; a control groove 610 is provided on the side wall of both the mounting box 60 and the cement head body 1. The control groove 610 is movably connected to the control pull block 61 and the stop pin body 62 to limit the position and angle of the stop pin body 62 when it is providing support, so as to ensure that the stop pin body 62 provides stable and reliable support for the rubber plug 5. The inner wall of the cement head body 1 is provided with a stop pin placement groove 620 that communicates with the control groove 610. The stop pin placement groove 620 is used to store the stop pin body 62 when the stop pin body 62 releases its support on the rubber plug 5, so as to prevent the stop pin body 62 from obstructing the rubber plug 5 from moving downward. A synchronous auxiliary push block 64 is slidably installed inside the mounting box 60. A shrinkage groove 640 is provided inside the mounting box 60 to provide sliding space for the synchronous auxiliary push block 64. An auxiliary wheel 641 is rotatably installed on the top of the outer end of the synchronous auxiliary push block 64. The auxiliary wheel 641 is in contact with the bottom surface of the stop pin body 62 to provide support and guidance during the resetting process of the stop pin body 62 and reduce the friction between the stop pin body 62 and the synchronous auxiliary push block 64. A receiving groove 642 is provided on the inner wall of the cement head body 1. The receiving groove 642 is connected to the shrinking groove 640. It is used to receive the end of the synchronous auxiliary push block 64 and the auxiliary wheel 641 when the support of the stop pin body 62 is released, so as to avoid the synchronous auxiliary push block 64 and the auxiliary wheel 641 interfering with the rotation of the stop pin body 62. The top of the control block 61 is provided with a drive tooth groove 63, which cooperates with the driver 7 to receive the power transmitted by the driver 7 and drive the control block 61 to slide.

[0031] The transmission mechanism in this embodiment includes a transmission gear 65, a transmission tooth groove 66, and a force-bearing tooth groove 67. The transmission gear 65 is rotatably installed inside the mounting box 60 and located between the control pull block 61 and the synchronous auxiliary push block 64. A transmission tooth groove 66 is provided on the bottom surface of the control pull block 61, and the transmission tooth groove 66 meshes with the transmission gear 65. At the same time, a force-bearing tooth groove 67 is provided on the top surface of the synchronous auxiliary push block 64, and the force-bearing tooth groove 67 meshes with the transmission gear 65. Through the transmission action of the transmission gear 65, the synchronous auxiliary push block 64 is driven to slide in the opposite direction when the control pull block 61 slides, so as to realize the linkage between the two.

[0032] The driver 7 in this embodiment includes a drive gear 70, a drive shaft 71, a transmission frame 72, a handle 73, and a positioning rod 74; The drive gear 70 is rotatably mounted inside the mounting box 60 and meshes with the drive tooth groove 63 to provide power for the sliding of the control block 61; the drive shaft 71 is rotatably mounted inside the mounting box 60 and fixedly connected to the drive gear 70 to transmit power; the transmission frame 72 is mounted on the outer end of the drive shaft 71, and the handle 73 is mounted on the outer wall of the transmission frame 72, so that the operator can drive the drive shaft 71 and the drive gear 70 to rotate by pulling the handle 73; Secondly, the positioning rod 74 is rotatably mounted on the transmission frame 72 near the outer wall of the mounting box 60, and is used to cooperate with the locking device 8 to fix the position of the driver 7.

[0033] In this embodiment, a locking device 8 is installed on the outer wall of the cement head body 1. The locking device 8 includes a first housing 80, a second housing 801, a top housing plate 81, a locking block 82, a spring 83, a handle 84, a movable groove 85, a positioning plug 86, and a positioning slot 87. The first housing 80 and the second housing 801 are installed on the outer wall of the cement head body 1 and above the stop pin assembly 6, for installing locking components. The top shell plate 81 is installed on top of the first housing 80 and the second housing 801, serving as a seal and support. Meanwhile, the locking block 82 is slidably installed inside the first housing 80 and the second housing 801 to block and lock the positioning rod 74. The spring 83 is installed inside the first housing 80 and the second housing 801 and is located between the top shell plate 81 and the locking block 82, for providing reset power to the locking block 82. The handle 84 is fixed to the outer wall of the locking block 82, and the movable groove 85 is opened on the outer wall of the first housing 80 and the second housing 801 and corresponds to the handle 84, making it convenient for the operator to slide the locking block 82 through the handle 84. The positioning insert 86 is installed on the bottom outer wall of the first housing 80, and the positioning slot 87 is opened on the bottom outer wall of the second housing 801 and cooperates with the positioning insert 86, for enhancing the stability of the connection between the first housing 80 and the second housing 801.

[0034] Through the coordinated operation of the above components, when it is necessary to release the rubber plug 5, the locking device 8 is operated to release the locking of the actuator 7, and the handle 73 is pulled to drive the stop pin body 62 to release the support of the rubber plug 5; when it is necessary to reset the stop pin body 62, the actuator 7 is operated in reverse, and under the action of the synchronous auxiliary push block 64, the stop pin body 62 is reset and re-supports the rubber plug 5. The whole process is convenient to operate and effectively improves the efficiency of cementing operations. The cementing head achieves rapid sliding and rotation of the stop pin body 62 through the transmission mechanism of the stop pin assembly 6. In conjunction with the linkage of the driver 7 and the locking device 8, it achieves rapid limiting and release of the rubber plug 5, which is convenient to operate and highly stable. The lateral sliding of the stop pin body 62 is coupled with the reverse movement of the synchronous auxiliary push block 64, and efficient linkage is achieved through gear transmission. It is suitable for cementing operations in oil extraction and effectively improves construction efficiency.

[0035] The working principle of this invention is as follows: when it is necessary to release the rubber plug 5, the support of the stop pin body 62 on the rubber plug 5 must be released first. First, the restriction of the locking device 8 on the driver 7 must be released. The operation is as follows: the operator holds the handle 84 of the locking device 8 and pulls the locking block 82 upward along the movable groove 85 on the outer wall of the first housing 80 and the second housing 801; this causes the locking block 82 to compress the spring 83 at the top. At this time, the inverted L-shaped structure at the bottom of the locking block 82 gradually disengages from the positioning rod 74. After it completely disengages, the locking of the positioning rod 74 is released. At this time, the first housing 80 and the second housing 801 maintain a stable connection through the cooperation of the positioning insert 86 and the positioning slot 87. The top shell plate 81 is fixed to the top of the first housing 80 and the second housing 801 by bolts, further supporting the fixation of the first housing 80 and the second housing 801 and also providing support for the spring 83. Next, the driver 7 drives the stop pin assembly 6 to start moving; the operation is to hold the handle 73 of the driver 7 and pull the transmission frame 72 outward, so that the transmission frame 72 drives the drive shaft 71 and the drive gear 70 to rotate in the mounting box 60; since the drive gear 70 meshes with the drive tooth groove 63 on the top of the control pull block 61, this operation will drive the control pull block 61 to slide along the control groove 610 towards the cement head body 1; While the control block 61 slides, the transmission tooth groove 66 on its bottom surface is engaged with the transmission gear 65, which will drive the transmission gear 65 to start rotating; and the transmission gear 65 is engaged with the force-bearing tooth groove 67 on the top surface of the synchronous auxiliary push block 64, causing the synchronous auxiliary push block 64 to slide along the shrinkage groove 640 in a direction away from the stop pin body 62, and the auxiliary wheel 641 at its end enters the receiving groove 642 along with the synchronous auxiliary push block 64, no longer supporting the stop pin body 62; As the control block 61 slides to the point where the bottom surface of the stop pin body 62 is separated from the auxiliary wheel 641, the bottom surface of the stop pin body 62 is also separated from the control groove 610. At this time, the stop pin body 62 will rotate downward under its own weight, so that the stop pin body 62 enters the stop pin placement groove 620. At this time, the stop pin body 62 is completely separated from the control groove 610 and no longer supports the rubber plug 5. The rubber plug 5 can smoothly descend, and the stop pin body 62 is in the unlocked state. When it is necessary to reset the stop pin body 62 to support the rubber plug 5, the operation must be reversed to reset the stop pin body 62. First, the driver 7 is reversed; specifically, the operator pushes the handle 73, causing the transmission frame 72 to drive the drive shaft 71 and drive gear 70 to rotate in the opposite direction. The drive gear 70 drives the control block 61 to slide along the control groove 610 to the outside of the cement head body 1 through the drive tooth groove 63. During the sliding process of the control block 61, the transmission tooth groove 66 drives the transmission gear 65 to rotate in the opposite direction, and then pushes the synchronous auxiliary push block 64 to slide along the shrinkage groove 640 toward the stop pin body 62 through the force-bearing tooth groove 67. Because the end face of the synchronous auxiliary push block 64 is in contact with the outer wall of the stop pin body 62, as the synchronous auxiliary push block 64 moves toward the stop pin body 62, its end will push the stop pin body 62, causing the stop pin body 62 to start rotating upward, ensuring that the stop pin body 62 can be smoothly reset. At the same time, the auxiliary wheel 641 at the end of the synchronous auxiliary push block 64 will also extend out from the storage groove 642 and gradually come into contact with the bottom surface of the stop pin body 62, providing further support for the rotation of the stop pin body 62. As the control block 61 continues to slide, the stop pin body 62 gradually slides out of the stop pin placement groove 620, and its outer end gradually extends into the cement head body 1; when the stop pin body 62 is pulled by the control block 61 to be in contact with the control groove 610, the control groove 610 will support the bottom of the stop pin body 62, so that the stop pin body 62 cannot change its angle, thereby ensuring the stability of the stop pin body 62 in supporting the rubber plug 5. Therefore, at this time, the outer end of the stop pin body 62 is already inside the cement head body 1, so that the rubber plug 5 can be supported smoothly. At this time, the outer end of the synchronous auxiliary push block 64 is located below the stop pin body 62, and the auxiliary wheel 641 is in close contact with the bottom surface of the stop pin body 62, so that the auxiliary wheel 641 cooperates with the control groove 610 to ensure the stability of the stop pin body 62. During this process, as the transmission frame 72 rotates, it drives the positioning rod 74 to rotate synchronously, causing the positioning rod 74 to press against the angled bottom of the locking block 82. As the transmission frame 72 continues to rotate, it forces the locking block 82 to slide upward until the transmission frame 72 rotates to its position. At this point, the locking block 82 is in a state where it can descend. Then, under its own weight and the drive of the spring 83, it slides down until its bottom inverted L-shaped structure re-fits with the outer wall of the positioning rod 74, locking the positioning rod 74 and thus fixing the position of the transmission frame 72 and the drive gear 70, ensuring that the stop pin body 62 is stably supported. When the spring 83 of the locking device 8 becomes less elastic due to long-term use, it needs to be replaced according to the following steps: First, disassemble the top structure of the locking device 8; that is, unscrew the bolts connecting the top shell plate 81 to the first shell 80 and the second shell 801, and then remove the top shell plate 81; at this time, the top of the spring 83 is no longer constrained, and the old spring 83 can be directly removed from the first shell 80 and the second shell 801, and then a new spring 83 can be replaced. Finally, the top shell plate 81 is reinstalled to complete the replacement of the spring 83. When the locking device 8 needs to be reassembled, the first step is still to remove the top shell plate 81, and then unscrew the bolts connecting the first shell 80 and the second shell 801 to the cement head body 1. At this time, the first shell 80 and the second shell 801 can be separated along the mating direction of the positioning insert 86 and the positioning slot 87, that is, the first shell 80 and the second shell 801 are separated, exposing the internal structure of the locking block 82 and the movable groove 85. When reassembling the locking device 8, insert the positioning block 86 of the first housing 80 into the positioning slot 87 of the second housing 801, and then tighten the bolts connecting the housing and the cement head body 1; then cover the top of the first housing 80 and the second housing 801 with the top shell plate 81, and tighten the bolts of the top shell plate 81 so that the spring 83 is in a pre-compressed state; at this time, the locking block 82 can slide flexibly along the movable groove 85 under the action of the new spring 83, and restore the locking function.

[0036] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A cementing head, characterized in that: It includes a cement head body (1), a head cap (2) and a rubber plug (5), wherein a stop pin assembly (6) is installed on the cement head body (1) and a driver (7) is installed on the stop pin assembly (6); The stop pin assembly (6) includes: The mounting box (60) is fixedly installed on the outer wall of the cement head body (1), and a control pull block (61) is slidably installed inside the mounting box (60), and a stop pin body (62) located inside the cement head body (1) is rotatably installed at the end of the control pull block (61). The control slot (610) is provided on the side wall of the mounting box (60) and the cement head body (1) and corresponds to the control pull block (61) and the stop pin body (62). The inner wall of the cement head body (1) is provided with a stop pin placement slot (620) that communicates with the control slot (610). Synchronous auxiliary push block (64) is slidably installed in mounting box (60) to push the stop pin body (62) to reset, and mounting box (60) is equipped with a transmission mechanism corresponding to synchronous auxiliary push block (64) to ensure that the control pull block (61) drives synchronous auxiliary push block (64) to slide in the opposite direction when sliding; When the stop pin body (62) is in contact with the control groove (610), the outer end supports the rubber plug (5), and the synchronous auxiliary push block (64) is located below the stop pin body (62).

2. The cementing head according to claim 1, characterized in that: The stop pin assembly (6) also includes: A shrinkage groove (640) is provided in the mounting box (60) for installing a synchronous auxiliary push block (64), and an auxiliary wheel (641) that is in contact with the bottom surface of the stop pin body (62) is rotatably mounted on the top of the outer end of the synchronous auxiliary push block (64). The receiving groove (642) is located on the inner wall of the cement head body (1) and communicates with the shrinkage groove (640) for receiving the end of the synchronous auxiliary push block (64) and the auxiliary wheel (641).

3. A cementing head according to claim 2, characterized in that: The distance by which the stop pin body (62) slides out of the control groove (610) is the same as the distance by which the synchronous auxiliary push block (64) slides into the storage groove (642), and when the stop pin body (62) is in the stop pin placement groove (620), the outer wall is in contact with the outer end face of the synchronous auxiliary push block (64).

4. A cementing head according to claim 1, characterized in that: The transmission mechanism includes: The transmission gear (65) is rotatably mounted in the mounting box (60), and the transmission gear (65) is located between the control pull block (61) and the synchronous auxiliary push block (64); The transmission tooth groove (66) is formed on the bottom surface of the control pull block (61) and meshes with the transmission gear (65); The force-bearing tooth groove (67) is opened on the top surface of the synchronous auxiliary push block (64) and meshes with the transmission gear (65).

5. A cementing head according to claim 4, characterized in that: The driver (7) includes: The drive gear (70) is rotatably mounted in the mounting box (60) and is not above the control pull block (61), and the top of the control pull block (61) is provided with a drive tooth groove (63) corresponding to the drive gear (70). A drive shaft (71) is rotatably mounted in a mounting box (60) and fixedly connected to a drive gear (70). A transmission frame (72) is mounted on the outer end of the drive shaft (71), and a handle (73) is mounted on the outer wall of the transmission frame (72). The positioning rod (74) is rotatably mounted on the outer wall of the transmission frame (72) near the mounting box (60).

6. A cementing head according to claim 3, characterized in that: When the inner end face of the control pull block (61) is in contact with the inner end face of the control groove (610), the outer end of the synchronous auxiliary push block (64) is located below the stop pin body (62), and when the inner end face of the synchronous auxiliary push block (64) is in contact with the inner end face of the shrinkage groove (640), the stop pin body (62) is located in the stop pin placement groove (620).

7. A cementing head according to claim 5, characterized in that: The outer wall of the cement head body (1) is equipped with a locking device (8) corresponding to the positioning rod (74) to restrict the position of the positioning rod (74). When the stop pin body (62) is in the state of supporting the rubber plug (5), the locking device (8) will lock the positioning rod (74) to ensure the fixation of the position of the stop pin body (62).

8. A cementing head according to claim 7, characterized in that: The locking device (8) includes: The first housing (80) and the second housing (801) are both installed on the outer wall of the cement head body (1) and are not above the stop pin assembly (6). The first housing (80) and the second housing (801) are slidably installed with locking blocks (82) to block the positioning rod (74). Top shell plate (81), which is mounted on top of the first shell (80) and the second shell (801); A spring (83) is installed inside the first housing (80) and the second housing (801), with one end of the spring (83) in contact with the top housing plate (81) and the other end in contact with the locking block (82); The handle (84) is fixedly installed on the outer wall of the locking block (82), and the outer walls of the first housing (80) and the second housing (801) are both provided with movable grooves (85) corresponding to the handle (84).

9. A cementing head according to claim 8, characterized in that: The first housing (80) and the second housing (801) are both connected to the cement head body (1) by bolts, and the outer walls of the first housing (80) and the second housing (801) are in contact with each other; The top shell plate (81) has multiple sets of through holes, and the top shell plate (81) is connected to the first shell (80) and the second shell (801) by multiple sets of bolts, which are used to fix the connection between the first shell (80) and the second shell (801); The bottom outer wall of the first housing (80) is provided with a positioning plug (86), and the bottom outer wall of the second housing (801) is provided with a positioning slot (87) that cooperates with the positioning plug (86).

10. A cementing head according to claim 9, characterized in that: The bottom cross section of the locking block (82) is inverted L-shaped, and the outer wall of the bottom of the locking block (82) is in contact with the outer wall of the positioning rod (74), and the outer corner of the bottom of the locking block (82) is designed with an angle.

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